<template>
  <li>
    <label>
      <input type="checkbox" :checked="todo.done" @change="handelCheck(todo.id)" />
      <span v-show="!todo.isEdit">{{ todo.title }}</span>
      <input 
      type="text" 
      v-show="todo.isEdit" 
      :value="todo.title"
      @blur="handelBlur(todo,$event)"
      ref="inputTitle"
      >
    </label>
    <button class="btn btn-danger" @click="handlDelete(todo.id)">删除</button>
    <button class="btn btn-edit" @click="handlEdit(todo)">编辑</button>
  </li>
</template>

<script>
export default {
  name: 'MyItem',
  props: ['todo', 'checkTodo','deleteTodo'],
  methods: {
    handelCheck(id) {
      this.checkTodo(id)
    },
    handlDelete(id){
      if(confirm('确定删除吗？')){
        this.deleteTodo(id)
      }
    },
    // 编辑
    handlEdit(todo){
      if(todo.isEdit == undefined){
        this.$set(todo,'isEdit',true)
      }else{
        todo.isEdit = true
      }
      this.$nextTick(function(){
        this.$refs.inputTitle.focus()
      })
    },
    // 失去焦点回调（真正执行修改逻辑）
    handelBlur(todo,e){
      todo.isEdit = false
      if(e.target.value.trim()=='') return alert('输入内容不能为空！！')
      this.$bus.$emit('updatatodo',todo.id,e.target.value)
    }
  }
}
</script>

<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}
li:hover{
  background-color: #ddd;
}
li:hover button{
  display: block;
}
</style>